Warning: package 'plotrix' was built under R version 2.11.1
Warning: package 'quantreg' was built under R version 2.11.1
Loading required package: SparseM
Warning: package 'SparseM' was built under R version 2.11.1
Package SparseM (0.86) loaded.
To cite, see citation("SparseM")

Warning: package 'plotrix' was built under R version 2.11.1
Warning: package 'quantreg' was built under R version 2.11.1
Loading required package: SparseM
Package SparseM (0.85) loaded.
To cite, see citation("SparseM")